Title CentOS 5.2/U-5.3 (2.6.19-default) root (hd0,0) kernel /vmlinuz-2.6.19-default ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.19.default.img Change the `default=1` to `default=0` on the top of the text. Now configure the grub boot loader via vim command and add the following text in the end of the file: